內容簡介
Invisible Anti-Spam & CAPTCHA 是一款無需用戶干預的防垃圾郵件外掛，透過加密挑戰自動保護各種表單，確保網站安全且不影響用戶體驗。
【主要功能】
• 自動防止垃圾郵件，無需用戶操作
• 支援所有表單，包括 WooCommerce 和各大表單外掛
• 自動識別流行的表單建構器並預設配置
• 可自定義自訂表單的垃圾郵件檢查
• 無需整合代碼，避免更新時出現問題
外掛標籤
開發者團隊
② 後台搜尋「Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms」→ 直接安裝（推薦）
📦 歷史版本下載
原文外掛簡介
Spam protection your visitors never see. No image grids, no “I’m not a robot” checkbox, no puzzles, nothing to click. Your visitors just hit Send — while their browser silently solves a tiny cryptographic challenge (proof-of-work) in a few milliseconds. Real humans never notice. Mass-spam bots either fail the challenge or have to burn so much computing power per message that spamming your site stops being worth it.
Every form, out of the box. WordPress logins, registrations and comments, WooCommerce checkout and reviews, and virtually every form plugin — Contact Form 7, Elementor Pro Forms, WPForms, Gravity Forms, Ninja Forms, Fluent Forms, Formidable and dozens more (full list below). One plugin protects all of them, and the most popular builders are detected and configured automatically on activation.
Truly universal — not a list of integrations
Most anti-spam tools protect only the form plugins they ship an integration for. If your builder is not on their list — or you use a hand-coded form, a theme’s built-in form, or three different builders on one site — you are on your own.
This plugin works differently: it recognizes submissions by their signature — the characteristic fields and actions of the request itself — instead of hooking into specific form plugins. That is why it covers any form:
Popular builders are recognized automatically: their signatures ship with the plugin and are pre-configured on activation.
Everything else — custom-coded forms, exotic builders, legacy themes — you teach the spam check yourself in under a minute: turn on direct analysis mode, submit the form once, click save. Done. No code, no waiting for the developer to add your builder.
And because no integration code is involved, nothing breaks when your form builder updates.
In practice that solves two everyday problems:
Real sites mix. A typical site has comments, a contact form from one builder, a newsletter signup from another, WooCommerce reviews — protecting each with its own anti-spam solution means more plugins, more settings pages, more things that can conflict. Here, one plugin covers the whole site.
Designers and agencies standardize. If you build sites for clients, you can install the same proven plugin on every project — no matter which form stack the client uses (or switches to later). One tool to know, one place to look when something needs attention.
Why “invisible” wins
Every CAPTCHA interaction costs you real visitors: an extra click here, an unreadable image there, “select all traffic lights” on a phone screen — and the contact request or sale is gone. This plugin flips the deal: instead of making humans prove themselves, it makes the device pay. The visitor’s browser proves it is a real, JavaScript-running client by doing a moment of invisible computation. Zero friction for people, real costs for bots.
Self-contained and featherweight
Everything runs on your own web server — there is no external service in the loop. That is not just a privacy nicety, it is an operational one:
Nothing external can fail. No third-party API whose outage, rate limit or latency silently breaks your forms. Your spam protection is exactly as available as your site.
Nothing external slows you down. No remote scripts, no extra DNS lookups or connections — your PageSpeed and Core Web Vitals stay untouched.
Tiny footprint. A few kilobytes of JavaScript and lean server code; runs fine on shared hosting, staging environments and even intranets without internet access.
Why not just use …
Google reCAPTCHA, hCaptcha or Turnstile? They require an account and API keys, load scripts from external servers (hello, consent banners) and still challenge real users when in doubt. This plugin needs no keys, loads no third-party scripts and never challenges anyone.
Akismet? Sends the content of every submission to an external service for analysis, and commercial sites need a subscription. Here, everything stays on your own server.
Honeypot fields and time checks? Modern bots skip honeypots routinely, and browser autofill loves to fill them by accident. Proof-of-work attacks the economics of spam instead of playing hide-and-seek.
And they all share one structural limit: they protect the forms they ship an integration for. This plugin protects the forms you actually have (see “Truly universal” above).
Key features
Invisible — zero user interaction, ever
Protects everything: logins, registrations, comments, WooCommerce, every form builder — even hand-coded custom forms
No account, no API keys, no external service for the spam check — install and you are done
Brute-force protection for logins, with optional Fail2Ban log support
Adaptive under-attack mode: the challenge automatically gets harder for everyone while a spam wave is running, and relaxes afterwards
Your choice per site: block spam, deliver it flagged, or just collect it in a spam inbox and watch
Teach it live: unrecognized custom form? Direct analysis mode adds it with one click, straight from the live page
Lightweight: a few KB of JavaScript, no render-blocking, no layout shift
Privacy-friendly by design: no cookies, no sessions, no tracking, no visitor data leaves your server, IP addresses are only stored as hashes — GDPR/DSGVO/RGPD-friendly without a consent banner
Free
Setup Guide
Works with
Pre-configured out of the box — as soon as the plugin is active, these are recognized automatically, no setup:
WordPress: Login, Password Reset, Comments
WooCommerce: Checkout, Login, Password Reset, Product Reviews (the shopping cart is deliberately not checked)
Form and page builders: Contact Form 7, WPForms, Elementor Pro Forms, Ninja Forms, Fluent Forms, Forminator, Gravity Forms, Formidable Forms, Everest Forms, WS Form, SureForms, MetForm, JetFormBuilder, Otter Blocks, Spectra, Kadence Blocks, Essential Blocks, Divi Forms, MW WP Form, Jetpack Forms, Mailchimp for WordPress, MailPoet, WP User Frontend, wpDiscuz, bbPress (topics & replies), Thrive Architect, Thrive Leads, Thrive Apprentice, Thrive Quiz Builder, Thrive Comments, UserFeedback, Popup Maker (subscription form), YITH WooCommerce Wishlist, Newsletter (subscription forms), CoBlocks, Popup Builder, Hustle, MailerLite, Email Subscribers, Quiz and Survey Master, WP-Polls, Form Maker, Gutena Forms, Happyforms, Brevo, Mailchimp List Subscribe, Calculated Fields Form, Crowdsignal Forms (NPS & feedback), Pirate Forms, Hostinger Reach, FormLayer, My Sticky Elements, Cool FormKit, Visual Form Builder, Royal Elementor Addons (forms), Happy Addons (Mailchimp form), Chaty (contact form), Jeg Kit (Mailchimp form), Element Pack Lite (contact form), Depicter (lead forms), Hello Plus (forms), PopupKit (subscription form), Brave Popup Builder (forms), Jetpack CRM (lead forms), Back In Stock Notifier (waitlist form)
Reviews, testimonials and guestbooks: Customer Reviews for WooCommerce, Strong Testimonials, Site Reviews, WP Ultimate Review, WP Customer Reviews, Gwolle Guestbook
Forums, directories and jobs: wpForo (topics & replies), WP Job Openings / HireZoot (applications), Directorist (contact & report forms)
Checkout and registration forms (recognised and recorded; blocking them is a separate switch, off by default): BuddyPress (registration), WP-Members (registration), ProfilePress (registration & checkout), Easy Digital Downloads (checkout), CartFlows (checkout login), Amelia (booking), Bookly (booking)
Added in under a minute, without code — switch on direct analysis mode, submit the form once, click save: registration forms (WordPress and WooCommerce), Ultimate Member, BuddyForms, MemberPress, Paid Memberships Pro, CheckoutWC & Flux Checkout, Quform, NEX-Forms, Bit Form, Funnelforms, Mailjet, SiteOrigin Page Builder, weForms, Responsive Contact Form Builder, Smart Forms, Kali Forms, ApplyOnline, FormCraft, CRM Perks Forms, Tripetto, Easy Form Builder, SimpleForm — and any hand-coded or custom form.
One honest limit: a form that is hosted elsewhere and only embedded on your page (Typeform, Jotform, Zoho Forms, HubSpot, OptinMonster and the like) sends its data straight to that service. The submission never reaches WordPress, so no WordPress plugin — this one included — can check it.
